I'm trying to change the value of my variable Pin at specific points in time during the ode15s solution, in order to evaluate the dynamic response. But I get the error:
Error using odearguments (line 83)The last entry in tspan must be different from the first entry.I believe the error is somewhere here:
t_start=0; t=t_start; y=cond; while idx_seg< length(t_seg) idx_seg=idx_seg+1; t_end=t_seg(idx_seg); [t_sol,y_sol]=ode15s(@(t,y)f1_v1,[t_start, t_end],y(end,:)); t = [t; t_sol(2 : end)]; y = [y; y_sol(2 : end, :)]; t_start = t_end; endHere's the full code:
function [t,y]=f2_v4_21_08_18(cond, t_seg, Pin) % -----Constants -----
N=3.38*10^6; k=2.96*10^-7; alphat=2.6*10^-5; chb=0.2; M=30*10^-9; K=5*10^(-8)*10^-3; H=0.42; S0=0.98; bp=0.8; ro=1040*10^6; Ey=10^4*0.00750062; v=3* 7.5*10^-6; r=[0.0119850000000000;0.00958500000000000;0.00764000000000000;0.00604000000000000;0.00473000000000000;0.00366000000000000;0.00400000000000000;0.00575500000000000;0.00726500000000000;0.00889500000000000;0.0107250000000000;0.0128500000000000;0.0153850000000000]; %mm
L=[1.27076497943190;0.932650928622621;0.544932761536915;0.303082765473283;0.161799106136796;0.155424891414508;0.245072221621871;0.475103125625241;0.273016623935407;0.427646038844292;0.634082325832342;0.846354695529459;0.938696601022114]; %mm h=[0.00484000000000000;0.00425000000000000;0.00381000000000000;0.00349000000000000;0.00327000000000000;0.00314000000000000;0.000309000000000000;0.00115000000000000;0.00145000000000000;0.00178000000000000;0.00215000000000000;0.00257000000000000;0.00308000000000000];%mm mu=[1.19409872390289e-05;1.12760032450214e-05;1.06583134073916e-05;1.00804835896938e-05;9.56162410894012e-06;9.20633512007761e-06;9.29628357913371e-06;9.96996247072375e-06;1.05291656347798e-05;1.10660983739492e-05;1.16035344790804e-05;1.21594980256614e-05;1.27473361251949e-05]; %mmHg*s
R= [1.8728 3.1728 4.3411 5.8457 7.8705 20.3059 22.6623 10.9961 2.6277 1.9250 1.4161 0.9612 0.5439]; %[mmHg*s/ml]
pdrop=[0,6.93,5.87,4.02,2.70,1.82,2.35,2.62,1.27,0.61,0.89,1.31,1.78,2.01]; n=[1,2,4,8,16,32,64,32,16,8,4,2,1]; %%%%%
idx_seg=0; function dy= f1_v1(t,y) dy=zeros(13,1); pt1=y(1); pt2=y(2); pt3=y(3); pt4=y(4); pt5=y(5); pt6=y(6); pt7=y(7); pt8=y(8); pt9=y(9); pt10=y(10); pt11=y(11); pt12=y(12); pt13=y(13); % -----Constants ----- ... R= [1.8728 3.1728 4.3411 5.8457 7.8705 20.3059 22.6623 10.9961 2.6277 1.9250 1.4161 0.9612 0.5439]; %[mmHg*s/ml] pdrop=[0,6.93,5.87,4.02,2.70,1.82,2.35,2.62,1.27,0.61,0.89,1.31,1.78,2.01]; for i=1:1:14 if i==1 pb(i)=Pin(idx_seg); else pb(i)=pb(i-1)-pdrop(i); end pb(i)=pb; end diffp=diff(pb)*(-1); pb_s=[pb(1)+pb(2);pb(2)+pb(3);pb(3)+pb(4);pb(4)+pb(5);pb(5)+pb(6);pb(6)+pb(7);pb(7)+pb(8);pb(8)+pb(9); pb(9)+pb(10);pb(10)+pb(11);pb(11)+pb(12);pb(12)+pb(13);pb(13)+pb(14)]; for z=1:1:14 S(z)=(((pb(z)^3+150*pb(z))^(-1) *23400)+1)^(-1); end deltaS=diff(S)*(-1); for j=1:1:13 kin=v; compl(j)=((3*pi*L(j)*r(j)^3)/(2*Ey*h(j)) )*10^-3; Vb(j)=(compl(j)/2)*pb_s(j); %[ml]
q(j)=diffp(j)/R(j); Vt(j)= chb*H*q(j)*deltaS(j)/M; end %%differential eq
dpt1=1/(alphat*Vt(1))*( (2*pi*K*r(1)*L(1))/h(1) *(1/2*(pb(1)+pb(2)) -pt1) -M*Vt(1)); dpt2=1/(alphat*Vt(2))*( (2*pi*K*r(2)*L(2))/h(2) *(1/2*(pb(2)+pb(3)) -pt2) -M*Vt(2)); dpt3=1/(alphat*Vt(3))*( (2*pi*K*r(3)*L(3))/h(3) *(1/2*(pb(3)+pb(4)) -pt3) -M*Vt(3)); dpt4=1/(alphat*Vt(4))*( (2*pi*K*r(4)*L(4))/h(4) *(1/2*(pb(4)+pb(5)) -pt4) -M*Vt(4)); dpt5=1/(alphat*Vt(5))*( (2*pi*K*r(5)*L(5))/h(5) *(1/2*(pb(5)+pb(6)) -pt5) -M*Vt(5)); dpt6=1/(alphat*Vt(6))*( (2*pi*K*r(6)*L(6))/h(6) *(1/2*(pb(6)+pb(7)) -pt6) -M*Vt(6)); dpt7=1/(alphat*Vt(7))*( (2*pi*K*r(7)*L(7))/h(7) *(1/2*(pb(7)+pb(8)) -pt7) -M*Vt(7)); dpt8=1/(alphat*Vt(8))*( (2*pi*K*r(8)*L(8))/h(8) *(1/2*(pb(8)+pb(9)) -pt8) -M*Vt(8)); dpt9=1/(alphat*Vt(9))*( (2*pi*K*r(9)*L(9))/h(9) *(1/2*(pb(9)+pb(10)) -pt9) -M*Vt(9)); dpt10=1/(alphat*Vt(10))*( (2*pi*K*r(10)*L(10))/h(10) *(1/2*(pb(10)+pb(11)) -pt10) -M*Vt(10)); dpt11=1/(alphat*Vt(11))*( (2*pi*K*r(11)*L(11))/h(11) *(1/2*(pb(11)+pb(12)) -pt11) -M*Vt(11)); dpt12=1/(alphat*Vt(12))*( (2*pi*K*r(12)*L(12))/h(12) *(1/2*(pb(12)+pb(13)) -pt12) -M*Vt(12)); dpt13=1/(alphat*Vt(13))*( (2*pi*K*r(13)*L(13))/h(13) *(1/2*(pb(13)+pb(14)) -pt13) -M*Vt(13)); pt_tot=[pt1;pt2;pt3;pt4;pt5;pt6;pt7;pt8;pt9;pt10;pt11;pt12;pt13]; dy=[dpt1;dpt2;dpt3;dpt4;dpt5;dpt6;dpt7;dpt8;dpt9;dpt10;dpt11;dpt12;dpt13]; end t_start=0; t=t_start; y=cond; while idx_seg< length(t_seg) idx_seg=idx_seg+1; t_end=t_seg(idx_seg); [t_sol,y_sol]=ode15s(@(t,y)f1_v1,[t_start, t_end],y(end,:)); t = [t; t_sol(2 : end)]; y = [y; y_sol(2 : end, :)]; t_start = t_end; end for i=1:1:14 if i==1 pb=Pin(idx_seg); else pb(i)=pb(i-1)-pdrop(i); end end diffp=diff(pb)*(-1); pb_s=[pb(1)+pb(2);pb(2)+pb(3);pb(3)+pb(4);pb(4)+pb(5);pb(5)+pb(6);pb(6)+pb(7);pb(7)+pb(8);pb(8)+pb(9); pb(9)+pb(10);pb(10)+pb(11);pb(11)+pb(12);pb(12)+pb(13);pb(13)+pb(14)]; for z=1:1:14 S(z)=(((pb(z)^3+150*pb(z))^(-1) *23400)+1)^(-1); end deltaS=diff(S)*(-1); for j=1:1:13 kin=v; compl(j)=((3*pi*L(j)*r(j)^3)/(2*Ey*h(j)) )*10^-3; %vessel compliance (ElBouri2018) [ml/mmHg]
Vb(j)=(compl(j)/2)*pb_s(j); %[ml] q(j)=diffp(j)/R(j); Vt(j)= chb*H*q(j)*deltaS(j)/M; end for m=1:1:13 pt_weight(m)=y_sol(m)*Vt(m); end Vttot=Vt.*n; Vt_sum=sum(Vttot); ptot=sum(1/Vt_sum * (pt_weight)); endThese are the initial conditions and times I run it with:
cond=[51.2112 ; 63.8766 ; 60.7979 ; 49.0010 ; 35.3767 ; 28.5718 ; 33.7930 ; 31.1300 ; 30.6594 ; 29.9741 ; 30.2541 ; 29.6828 ; 28.9798 ]; [t, y] = f2_v4_21_08_18(cond, [0, 10, 100], [60, 70, 60]);plot(t, y);Thanks in advance!
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